package com.stenio.fancat.util;

import java.io.UnsupportedEncodingException;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import com.stenio.fancat.common.constants.GlobalConstant;

/**
 * SecretUtils {3DES加密解密的工具类 }
 * 
 */
public class DESedeUtil {

	// 定义加密算法，有DES、DESede(即3DES)、Blowfish
	private static final String Algorithm = "DESede";
	private static final String PASSWORD_CRYPT_KEY = "2019PinganVitality075522628888ForShenZhenBelter075561869839";

	/**
	 * 加密方法
	 * 
	 * @param src
	 *            源数据的字节数组
	 * @return
	 */
	public static byte[] encryptMode(byte[] src) {
		try {
			SecretKey deskey = new SecretKeySpec(build3DesKey(PASSWORD_CRYPT_KEY), Algorithm); // 生成密钥
			Cipher c1 = Cipher.getInstance(Algorithm); // 实例化负责加密/解密的Cipher工具类
			c1.init(Cipher.ENCRYPT_MODE, deskey); // 初始化为加密模式
			return c1.doFinal(src);
		} catch (java.security.NoSuchAlgorithmException e1) {
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	/**
	 * 解密函数
	 * 
	 * @param src
	 *            密文的字节数组
	 * @return
	 */
	public static byte[] decryptMode(byte[] src) {
		try {
			SecretKey deskey = new SecretKeySpec(build3DesKey(PASSWORD_CRYPT_KEY), Algorithm);
			Cipher c1 = Cipher.getInstance(Algorithm);
			c1.init(Cipher.DECRYPT_MODE, deskey); // 初始化为解密模式
			return c1.doFinal(src);
		} catch (java.security.NoSuchAlgorithmException e1) {
			e1.printStackTrace();
		} catch (javax.crypto.NoSuchPaddingException e2) {
			e2.printStackTrace();
		} catch (java.lang.Exception e3) {
			e3.printStackTrace();
		}
		return null;
	}

	/*
	 * 根据字符串生成密钥字节数组
	 * 
	 * @param keyStr 密钥字符串
	 * 
	 * @return
	 * 
	 * @throws UnsupportedEncodingException
	 */
	public static byte[] build3DesKey(String keyStr) throws UnsupportedEncodingException {
		byte[] key = new byte[24]; // 声明一个24位的字节数组，默认里面都是0
		byte[] temp = keyStr.getBytes(GlobalConstant.PLATFORM_CHARACTER_ENCODING); // 将字符串转成字节数组

		/*
		 * 执行数组拷贝 System.arraycopy(源数组，从源数组哪里开始拷贝，目标数组，拷贝多少位)
		 */
		if (key.length > temp.length) {
			// 如果temp不够24位，则拷贝temp数组整个长度的内容到key数组中
			System.arraycopy(temp, 0, key, 0, temp.length);
		} else {
			// 如果temp大于24位，则拷贝temp数组24个长度的内容到key数组中
			System.arraycopy(temp, 0, key, 0, key.length);
		}
		return key;
	}

	public static void main(String[] args) throws UnsupportedEncodingException {
		String text = "www.hello.com.cn/qbq/呵呵/789";
		String encodeStr = encode(text);
		System.out.println("加密:" + encodeStr);
		System.out.println("解密:" + decode(encodeStr));

	}

	public static String encode(String msg) {
		// 3DES加密
		byte[] secretArr = DESedeUtil.encryptMode(msg.getBytes());
		// Base64编码
		final Base64.Encoder encoder = Base64.getUrlEncoder();
		final String encodedText = encoder.encodeToString(secretArr);
		return encodedText;
	}

	public static String decode(String decodeMsg) {
		// Base64解码
		final Base64.Decoder decoder = Base64.getUrlDecoder();
		byte[] b64Array = decoder.decode(decodeMsg);
		// 3DES解密
		byte[] myMsgArr = DESedeUtil.decryptMode(b64Array);
		return new String(myMsgArr);
	}

}